Java 无法解析充气机和容器_Java_Android_Android Fragments_Webview_Android Studio

Java 无法解析充气机和容器

java android android-fragments webview android-studio

Java 无法解析充气机和容器,java,android,android-fragments,webview,android-studio,Java,Android,Android Fragments,Webview,Android Studio,为什么在我的活动中“充气机和容器”没有得到解决？我应该怎么写 import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.webkit.WebChrom

为什么在我的活动中“充气机和容器”没有得到解决？我应该怎么写

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;

public class GamesFragment extends Fragment {

private ProgressBar progress;
private WebView myWebView;


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    myUIUpdate();
    return null;
}

private void myUIUpdate() {
    View rootView = inflater.inflate(R.layout.fragment_games, container, false);


    String url = "http://gsmarena.com";
    myWebView = (WebView) rootView.findViewById(R.id.webViewGames);
    myWebView.setWebChromeClient(new myWebViewClient());
    myWebView.getSettings().setJavaScriptEnabled(true);
    progress = (ProgressBar) rootView.findViewById(R.id.progressBar);
    myWebView.loadUrl(url);
    progress.setMax(100);


    myWebView.setWebViewClient(new WebViewClient() {

        @Override
        public boolean shouldOverrideUrlLoading(WebView View, String url) {
            View.loadUrl(url);
            GamesFragment.this.progress.setProgress(0);
            return true;
        }

    });


    myWebView.setOnKeyListener(new android.view.View.OnKeyListener()

    {
        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (event.getAction() == KeyEvent.ACTION_DOWN) {
                WebView webView = (WebView) v;

                switch (keyCode) {
                    case KeyEvent.KEYCODE_BACK:
                        if (webView.canGoBack()) {
                            webView.goBack();
                            return true;
                        }
                        break;
                }
            }

            return false;
        }
    });
    return rootView;

}


private class myWebViewClient extends WebChromeClient {
    @Override
    public void onProgressChanged(WebView view, int newProgress) {
        GamesFragment.this.setValue(newProgress);
        super.onProgressChanged(view, newProgress);
    }
}

@Override
public void setUserVisibleHint(boolean visible) {
    super.setUserVisibleHint(visible);
    if (visible && isResumed()) {
        myUIUpdate();
    }
}

public void setValue(int progress) {
    this.progress.setProgress(progress);
}


}

我正在尝试附加myUIUdate，因为要在屏幕上看不到我的片段时隐藏它，请使用以下命令：

@Override
public void setUserVisibleHint(boolean visible) {
    super.setUserVisibleHint(visible);
    if (visible && isResumed()) {
        myUIUpdate();
    }
    }

PS：如果有人有更好的办法隐藏片段，我喜欢听。

更改：

   private void myUIUpdate()

到

并将充气机和容器传递给它：

   myUIUpdate(inflater, container);

因为在

myUIUpdate（）

方法中未找到

充气机和容器；作为
并将（同时更改返回类型）更改为
到
编辑
在方法中写入myUIUpdate
，并作为从中删除
并将myUIUpdate
方法重写为
private void myUIUpdate(View view) {
    String url = "http://gsmarena.com";
    myWebView = (WebView) view.findViewById(R.id.webViewGames);
    myWebView.setWebChromeClient(new myWebViewClient());
    myWebView.getSettings().setJavaScriptEnabled(true);
    progress = (ProgressBar) view.findViewById(R.id.progressBar);
    myWebView.loadUrl(url);
    progress.setMax(100);

    myWebView.setWebViewClient(new WebViewClient() {

        @Override
        public boolean shouldOverrideUrlLoading(WebView View, String url) {
            View.loadUrl(url);
            GamesFragment.this.progress.setProgress(0);
            return true;
        }

    });

    myWebView.setOnKeyListener(new android.view.View.OnKeyListener() {@Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (event.getAction() == KeyEvent.ACTION_DOWN) {
                WebView webView = (WebView) v;

                switch (keyCode) {
                    case KeyEvent.KEYCODE_BACK:
                        if (webView.canGoBack()) {
                            webView.goBack();
                            return true;
                        }
                        break;
                }
            }
            return false;
        }
    });
}

LayoutFlater充气机、ViewGroup容器、Bundle savedInstanceState这些都是您使用的块的本地设置
无需创建自定义方法来初始化片段中布局中的所有视图，请尝试覆盖onViewCreated并将所有myUIUpdate（）代码移到onViewCreated
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.info_fragment, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        myWebView = (WebView) view.findViewById(R.id.webViewGames);
        myWebView.setWebChromeClient(new myWebViewClient());
        myWebView.getSettings().setJavaScriptEnabled(true);
        progress = (ProgressBar) view.findViewById(R.id.progressBar);
        myWebView.loadUrl(url);
        progress.setMax(100);


        myWebView.setWebViewClient(new WebViewClient() {

            @Override
            public boolean shouldOverrideUrlLoading(WebView View, String url) {
                View.loadUrl(url);
                GamesFragment.this.progress.setProgress(0);
                return true;
            }

        });


        myWebView.setOnKeyListener(new android.view.View.OnKeyListener()

        {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if (event.getAction() == KeyEvent.ACTION_DOWN) {
                    WebView webView = (WebView) v;

                    switch (keyCode) {
                        case KeyEvent.KEYCODE_BACK:
                            if (webView.canGoBack()) {
                                webView.goBack();
                                return true;
                            }
                            break;
                    }
                }

                return false;
            }
        });
    }

您将获得充气机
和容器

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    myUIUpdate();
    return null;
}

他们是当地人。您必须将它们作为参数传递给myUIUpdate
，或者在活动中声明字段
，并在onCreateView
中分配它们（这是一个难看的解决方案）。您能指出显示错误的确切行吗？顺便说一句，我看到充气器和容器不是实例变量。你在哪里初始化它们？在应用它之后。myUIUpdate（）；在Override public void中，setUserVisibleHint（布尔可见）{super.setUserVisibleHint（可见）；if（可见和&isResumed（））{myUIUpdate（）；}给我一个错误“游戏片段中的myUIUpdate（LayoutFlater，ViewGroup）无法应用于（）添加代码后，应用程序崩溃请查看日志E/AndroidRuntime（30911）：java.lang.NullPointerException：在添加您编辑的代码myUpdate（）后，再次尝试在空对象引用上调用虚拟方法“android.view.view android.view.view.findViewById（int）”无法应用游戏中的视图片段错误以布尔形式出现isResumed=false；@Override public void setUserVisibleHint（布尔isVisibleToUser）{super.setUserVisibleHint（isVisibleToUser）；{if（isVisibleToUser&&isResumed（））{myUIUpdate（）；isResumed=true；}
private View myUIUpdate(LayoutInflater inflater, ViewGroup container) {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_games, container, false);
    return rootView;
}


@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    myUIUpdate(view);
}

private void myUIUpdate(View view) {
    String url = "http://gsmarena.com";
    myWebView = (WebView) view.findViewById(R.id.webViewGames);
    myWebView.setWebChromeClient(new myWebViewClient());
    myWebView.getSettings().setJavaScriptEnabled(true);
    progress = (ProgressBar) view.findViewById(R.id.progressBar);
    myWebView.loadUrl(url);
    progress.setMax(100);

    myWebView.setWebViewClient(new WebViewClient() {

        @Override
        public boolean shouldOverrideUrlLoading(WebView View, String url) {
            View.loadUrl(url);
            GamesFragment.this.progress.setProgress(0);
            return true;
        }

    });

    myWebView.setOnKeyListener(new android.view.View.OnKeyListener() {@Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (event.getAction() == KeyEvent.ACTION_DOWN) {
                WebView webView = (WebView) v;

                switch (keyCode) {
                    case KeyEvent.KEYCODE_BACK:
                        if (webView.canGoBack()) {
                            webView.goBack();
                            return true;
                        }
                        break;
                }
            }
            return false;
        }
    });
}

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.info_fragment, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        myWebView = (WebView) view.findViewById(R.id.webViewGames);
        myWebView.setWebChromeClient(new myWebViewClient());
        myWebView.getSettings().setJavaScriptEnabled(true);
        progress = (ProgressBar) view.findViewById(R.id.progressBar);
        myWebView.loadUrl(url);
        progress.setMax(100);


        myWebView.setWebViewClient(new WebViewClient() {

            @Override
            public boolean shouldOverrideUrlLoading(WebView View, String url) {
                View.loadUrl(url);
                GamesFragment.this.progress.setProgress(0);
                return true;
            }

        });


        myWebView.setOnKeyListener(new android.view.View.OnKeyListener()

        {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if (event.getAction() == KeyEvent.ACTION_DOWN) {
                    WebView webView = (WebView) v;

                    switch (keyCode) {
                        case KeyEvent.KEYCODE_BACK:
                            if (webView.canGoBack()) {
                                webView.goBack();
                                return true;
                            }
                            break;
                    }
                }

                return false;
            }
        });
    }

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    myUIUpdate();
    return null;
}